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| a longitudinal wave in an elastic medium, especially a wave producing an audible sensation |
| a substance possessing perfect molecular mobility and the property of indefinite expansion, as opposed to a solid or liquid |
| gravitational field | |
| —n | |
| the field of force surrounding a body of finite mass in which another body would experience an attractive force that is proportional to the product of the masses and inversely proportional to the square of the distance between them | |